Asme b30 5 mobile and locomotive cranes requires a design factor of 3 5 for 6 strand hoist ropes.
Breaking strength of 3 16 wire rope.
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It is recommended not to exceed 1 3 3 1 design factor of the rope s strength to maintain a useful service life.
For wire rope generally you want a safety factor of 5 1.
This would put you into 5 16 cable.
Aircraft grade wire rope.
The weakest point in the line is the knot or slice.
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6x19 class improved plow steel.
Starlift xtra wire rope has one of the highest strength to diameter ratios on the market.
The mbf of starlift xtra is such.
Industrial wire rope 7390 harrison avenue cincinnati ohio 45247 888 345 0919.
Crown bolt 64742 at 18 58.
Knots and splices will reduce the breaking strength of a line by as much as 50 to 60 percent.
Rope diameter minimum breaking strength safe load weight in mm lb f kn lb f kn lb m ft kg m 1 4.
The same standard requires a design factor of 5 0 for rotation resistant ropes.
These are the listed breaking strengths of each rope type and size.
So if you want a 1700 lbs working load limit wll take that number x 5 which 8500.
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6x37 class wire ropes with 27 46 wires per strand.
6 x 19 iwrc wire rope.
However a splice is stronger than a knot.
6x19 class wire ropes with 15 26 wires per strand.
Maximum load capacity the wire.
These wire ropes come in fiber core or iwrc variations with diameters ranging from to 1 1 3 and tensile strengths of 2 74 tons to 69 4 tons.
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2 5 x 1 57 2 x 900 5 546 pounds of breaking strength.
General purpose aircraft grade braided wire rope 12 99.
Rope diameter minimum breaking strength safe load safety factor 12 weight in mm lb f kn lb f kn lb m ft kg m 3 16.